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Type: Posts; User: ggunn

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  1. Have you looked at Red Vector? ...

    Have you looked at Red Vector?

    https://www.redvector.com
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    Ah. I stand corrected. I heard that they were...

    Ah. I stand corrected. I heard that they were going to move to the 2014 NEC; I thought it would be for the next exam. Exam after next, then. Thanks for the correction.
  3. Thread: DC arcs

    by ggunn
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    Actually, many batteries (especially big ones)...

    Actually, many batteries (especially big ones) have a pretty low internal resistance and operate very close to a constant voltage source for a good portion of their IR curve, i.e. the current has a...
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    The one coming up is the first to use the 2014...

    The one coming up is the first to use the 2014 NEC. When they change they let us know, but it is the same exam for everyone, held at the same time down to the minute, and strictly proctored.
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    And an excellent opportunity for a "gotcha" on...

    And an excellent opportunity for a "gotcha" on the NABCEP exam. The difference between an exam and the real world, of course, is that in the real world you would not be penalized nearly as much for...
  6. Thread: CFL & Fire

    by ggunn
    Replies
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    874

    I don't know what the lifetime should be, but I...

    I don't know what the lifetime should be, but I have a box of failed CFL's. A couple of them got pretty hot when they failed.
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    An interesting factoid in calculating ampacity is...

    An interesting factoid in calculating ampacity is that XHHW-2 is exempt from the rooftop adder for temperature derating (exception to 310.15(B)(3)(c)).
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    My understanding of the way AFD works on the DC...

    My understanding of the way AFD works on the DC side of SMA inverters (from talking to a rep at an SPI show) is that it looks for a characteristic noise signature on the DC lines. And that's all I...
  9. Thread: CFL & Fire

    by ggunn
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    24$$
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    The LED's I have installed are holding up well so...

    The LED's I have installed are holding up well so far.
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    Look for an SMA white paper. They were one of the...

    Look for an SMA white paper. They were one of the first to build DC AFD into their inverters.
  11. Thread: CFL & Fire

    by ggunn
    Replies
    24$$
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    874

    FWIW, I had a CFL in a lamp that started...

    FWIW, I had a CFL in a lamp that started flickering and making a zzzzzttt noise. I turned it off and reached in to unscrew it, and I burned my hand on the base. That incident and this story is...
  12. Ah. That 'splains it. Thanks.

    Ah. That 'splains it. Thanks.
  13. Then I must have completely misinterpreted a...

    Then I must have completely misinterpreted a dialog we had in this subforum a few months ago about this issue. That was before I got my 2014 NEC, though, and I hadn't thought about it since then.
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    In this case it was static IP's on a big...

    In this case it was static IP's on a big intranet. As machines moved off the network (which they did all the time for whatever reason), gaps appeared. In order to close the gaps he had to reassign IP...
  15. And half the people you meet have an IQ of less...

    And half the people you meet have an IQ of less than 100. :D
  16. Thread: CFL & Fire

    by ggunn
    Replies
    24$$
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    874

    Is it possible that the last time the switch was...

    Is it possible that the last time the switch was turned off it retained something resistive across the contacts which became a glowing series fault and started the fire? I know that's a reach...
  17. I apologize for stating the obvious, but before...

    I apologize for stating the obvious, but before you enter into any dealings with the IRS, it behooves one to get tax advice from a CPA. You decided how much withholding you needed to do on an...
  18. This is fixed in the 2014 code. 125% of the...

    This is fixed in the 2014 code. 125% of the inverter's maximum output current is carried all the way back to the service for the 120% rule calculations. The size of the OCPD is no longer used.
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    My daughter had a parakeet that she kept in a...

    My daughter had a parakeet that she kept in a cage in her bathroom much of the time. Her bathroom was also the guest bathroom, and I had (still do) a weekly get together with my musician friends to...
  20. Yeah, I hate it when that happens. :D

    Yeah, I hate it when that happens. :D
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    A friend of mine was an IT manager for the court...

    A friend of mine was an IT manager for the court system in a big city. One day his manager (think "pointy haired boss" from Dilbert) walked into his office with a spreadsheet of the IP numbers of all...
  22. I guess my standard would be to lay things out in...

    I guess my standard would be to lay things out in such a way that the next guy who comes along can look at it and readily see what is connected to what.
  23. When I am wiring up audio connectors I tin...

    When I am wiring up audio connectors I tin stranded conductors with solder before landing them under a screw.
  24. And that is another problem. As manufacturing...

    And that is another problem. As manufacturing processes become more and more automated they put more and more people out of work. In the end, what was once an opportunity for many people to share in...
  25. Thread: 110.21(B)

    by ggunn
    Replies
    11$$
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    Most of the signs and placards I see around here...

    Most of the signs and placards I see around here are red engraved plastic (white lettering) attached with double sided tape. There is a trophy shop in town that makes them.

    As someone else has...
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